One of the cultivation failure reasons of Jatropha curcas Linn (JcL) in
Indonesia was that it was only recommended for Crude Jatropha Oil (CJO)
production which is processed into biodiesel. CJO is only 17-25% of dry
seed weight, while the waste residue is called seed cake. Another waste
product is dried capsule husk (DH-JcL) which is about 30-80% of the
fresh fruit weight and sludge CJO (S-CJO) or about 2-5% of the CJO.
S-CJO was unutilized which is bad for the ecology when it is disposed.
The research objective was the utilization of the S-CJO waste for
bio-refinery and improvement productivity of biogas made from DH-JcL.The
study was conducted at the research garden of PT Bumimas Ekapersada,
Bekasi, West Java in November-December 2012. A liter one-stage digester
was compiled completely as a randomized design (CRD) with three
replications in a water bath at a temperature of 32o C. The materials
used were DH-JcL of JatroMas cultivars in the toxic category which were
mixed with the sludge S-CJO as a co-substrate about with 10% water at a
ratio of 1:8. Observation variables were biogas production volume (water
displacement method), pH and temperature in the outlet slurry. The
preliminary study concludes that S-CJO is appropriate as the
co-substrate DH-JcL. It can increase the biogas productivity with feed
in less than 10% of S-CJO allocation per day.